Firing port



Patented Nov. 13, 1934 STATES FIRING PORT Paul B. Tonnar, Cleveland, Ohio Application August 8,

6 Claims.

This invention relates to apparatus for burning fuel and more particularly to an adjustable firing port adapted to project combustible materials along with sufficient air into the rening chamber of a metallurgical furnace. The ring port herein disclosed and claimed in detail may be incorporated in the type of open hearth furnace disclosed in my co-pending application, Serial No. 629,249, led August 17, 1932, wherein the same is shown, but not claimed.

In the present day practice of operating metallurgical furnaces, and particularly open hearth furnaces, fuels and air are introduced into the refining chambers thereof through ports disposed in the wall at one end of the furnace chamber and the products of combustion are conveyed from the furnace chamber through like ports in the opposite end wall of the furnace. The discharge ports, when the operation of the furnace is reversed, constitute the ports through which the fuel and air are projected into the furnace. This reversal of the flow of hot gases along with the suspended matter carried thereby caused eroding: of the furnace ports resulting in a continual change in the effective area of the ports, with a subsequent change in the velocity and direction of the flow of gases into the furnace chamber. Furthermore, the lack of definite control of the flow of hot gases and the direction of the flame introduced burner into the refining chamber of a furnace. The firing port is capable of relative movement with respect to both the flue and the furnace wall and at the same time an effective seal is maintained between the firing port and both the flue and the furnace wall. The combustible mixture or flame may therefore be projected into the furnace at any angle which would be consistent with the economical operation of the furnace or the system of firing employed therein. A more intimate and rapid uniting of air and fuel and the consequent more rapid and complete combustion is accomplished. The definite control of the direction and size of the flame and the resultant into the furnace chamber was notconducive of oven gas, from an axially disposed fueljtube 1932, Serial No. 627,922

effectiveness thereof is a further feature of my ring port.

Various advantageous features'of this invention not at this time more particularly enumerated will become more apparent asthe nature of the invention is better understood froml the following detailed description thereof, considered in conjunction with the accompanying drawings, wherein similar characters of reference designate similar parts and wherein:

Figure 1 is a sectional elevation of my firing port illustrating the relation thereof to the preheated air flue and furnace wall.

Figure 2 is a sectional view taken on the line 2-2 of Figure 1.

Figure 3 is an enlarged sectional View, partly l broken away, illustrating the seal between the firing port and the preheated air flue.

Figure 4 is a sectional view` illustrating the mounting of the firing port. l

Figure 5 is a sectional view taken on the line 5-5 of Figure 4.

Referring now to Figures 1 and 2 of the drawings the illustrated embodiment of the invention comprises a firing port designated in its entirety by the numeral 1. The firing port 1 is supported on the soleplate of an air fiue 2, which is preferably a cylindrical sheet metal conduit having a re brick lining, and which conveys the preheated-air from the regenerator chambers or the recuperator (not shown) tothe firing port through the central passage 3 thereof.- Although the firing port asillustrated is supported on the top of the fue 2, installations thereof may necessitate the suspension thereof froman overhead verticalflue or it may be mounted on and receive air fromv a horizontal flue andthese modications are deemed to be within they purview of this invention. The upper surface of the air flue 2 has slidably mounted thereon a circular casting 4. The bottom face of the casting 4 which rests on the top surface of the air flue 2 is provided with an annular recess 5 which receives an upstanding annular flange 6 formed on the top surface of the sole plate which terminates thev flue 2 and permits a limited amount of lateral movement of casting 4 relative to the top of flue 2 to compensate for thelateral expansion or contraction of the furnace walls. yA central passager? is formed in the casting 4 and co-operates with the passage 3 in the ue 2 to conduct heated air from the latter to the firing port.

On thecasting 4, adjacent the passage 7 and extending outwardly therefrom, a concave surface 8 is formed which receives the base casting 24 of the body portion of the firing port and will be referred to hereinafter more in detail. The casting 4 is preferably hollow to provide a chamber 9 through which cooling Imedium is adapted to flow. Extending outwardly from the casting 4 is an annular flange 22 upon which is mounted a plurality of spaced bracket members 10 in which 4are journalled trunnions l1, the latter carrying rollers 12. The rollers 12 support a circular plate or turntable 13 through a depending ange 14 which engages the trough formed on the periphery of the rollers.

Secured to the plate 13 are a pair of diametrically disposed bracket members 15 having trunnion bearings 16 formed integrally therewith in which are supportedA trunnions 1'7 and 17a. The trunnions 17 and 17a have formed on one end thereof a flanged portion lf'which is secured to ythe body portion 19 of the firing port in-any suitable manner such as by welding or riveting. The body'portion 19 is provided on the lower extremity thereof with an elliptical base casting 24 which is provided with a surface complemental to the surface 8 on the casting 4. toA effect a seal between these two members. 'The working surface on casting. 24 is. interrupted to form a continuous recess 40 adapted to contain a suitable packing :an eccentric member 23 carried by the bearings 16, and are provided with levers 23a. A set screw 18a extendsthrough the cap. of the bearing and engages the trunnion 17a. Adjustment of this set screw permits the hold-ing of thetrunnions 1'7 and 17a in xed rotational position relative to the bearings 16. `The eccentric 23 is of such configuration that movement of the levers 23a in a direction away from the furnace will unseat the base 24 of vthe body. po-rtion of the firing port from the concave surface'of'the casting 4 and simultaneously therewith break the seal be- .tween a surface 31- formed on the firing port and surface 32 of a seat 33 located in the walls of the furnace hereinafter referred to, thereby breaking the friction/at the `above mentioned pointsV andy thus permitting easy directional adjustment of the `firing port. The annular plate 13 carries a depending cylindrical guard plate 20 which abuts a sealing gasket-21 carried bythe outwardlyextending flange An elliptical flexible member 13a is disposed between the ring 13 rand thev body portion 19 of thering port to also exclude dust, vor prevent thelescape "of air whichjmight filter through the joint between the base 24 and the surface 8. Therlring port 1 ispreferably formedwith a nose portion 26 which when in operating position projects through an aperture 27 formed in a furnace wall 28. This nose portion 26 is preferably encased in a circular metal water cooled .jacket 30 provided with a circular outwardly extendingflange 30a. This ange is formed with the concave surface 31 facing the furnace wall which co-,acts with a complementary surface 32 formed on the water .cooled seat 33 surrounding the aperture 27' adjacent theoutermost portion thereof. When thezsurface 31 of the nosey portion-isiseatedon the surfacev 32 effective seal is provided between the nose portion' and the wall of the furnace.

Extending axially through the nose portion of the ring port is a fuel tube 35. This fuel tube is supported in a water cooled mounting 36 extending rearwardly from the body portion of the firing port. A ball and socket joint 3'7 is formed thereon to permit movement of the nozzle of the fuel tube 35 within the connes of the nose portion 26 of the firing port and independent of the adjustable movements of the ring port.

The fuel tube 35 is adapted to project liquid or gaseous fuels in the presence of or surrounded by preheated air conveyed to the firing'port 1 through flue-3l into the furnace. Provision is made in the body of the tube or burner 35 to atomize the liquid fuel by means of air or steam.

Itwill-be apparent from the foregoing description that I have provided a firing port which is capable of rotationaland tilting movements with respect to its support and whereby it. will be possible to project fuel and air into the furnace. at any desired angle commensurate` with the system of firing employed in the operation of the furnace; furthermore that an effective seal is at.

all times maintained between the body/portion of the firing port and the' air flue and between the nose portion of the firing` port andthe fur-- nace wall.

Although the foregoing description. is necessarily of a detailed character to completely set forth this invention, I do' not. wish .to be limited thereby other thanby the appended claims.

I claim:

1. In a metallurgical furnace, in combination, an air flue, a furnace wall having an.` aperture therein, a hollow body member for projecting preheated air from said flue into the furnace having a nose portion. which is encompassed by the wall of the aperture, said body member being givena tiltable and rotatable mounting whereby said nose portion maybe adjusted at varying angles relative to said aperture, and means 'extended' through said hollow body member and terminating -near the discharge end thereof for projecttherein, vaxhollow body member for projecting preheated air from theflue intothe. furnace and having a nose portion'which is encompassedby the wall of the aperture, said body member being given a tiltable. andv lrotatable mounting whereby said nose portion may be adjusted at Varying angles relative tosaid aperture, a fuelprojecting tube extended through saidhollow body member and terminating within. the confines of said nose portion, and means for adjusting said tube at varying angles independently of said body member. j

3. In a metallurgical furnace,` in combination, an air flue, a'furnacewall having an aperture therein, a hollow 'body member for projecting preheated air from said'flue into the furnace having a -nose portion whichis encompassedby the wallof the aperture, said body member being given a tiltable and rotatable mounting. whereby said nose portion maybe adjusted. at: varyinglangles relativey to said aperture; and an independently adjustabley tubular fuel-projecting-.member extendedv through .said body. member.;

and terminating adjacent the discharge end of the nose portion.

4. In a metallurgical furnace, in combination, a furnace wall having an aperture therethrough and a ue adapted to convey heated air, and a firing port provided with a base having a sealed universally movable connection with the Wall of said flue and a nose portion which projects into and is encompassed by the Wall of said aperture and has a universally movable sealed connection with said latter Wall.

5. In a metallurgical furnace, in combination, a furnace Wall having an aperture therethrough and a flue adapted to convey heated air, a ring port provided with a base having a sealed universally movable connection with the top wall of said flue and a nose portion which projects into and is encompassed by the Wall of said aperture and hasva universally movable sealed connection with said latter Wall, and means for tilting and rotating said port.

6. In an open hearth furnace, in combination, a furnace Wall having an aperture therethrough, and a flue adapted to convey heated air, a rng port having its base communicating with said flue and a nose portion which projects into said aperture, a sealed rotatable and tiltable bearing connection between the base of said port and top Wall of said flue, a sealed universally movable joint connection between said nose portion and the surrounding Wall of the aperture, and means for tilting and rotating said ring port.

PAUL B. TONNAR. 

